Using both sides of the panel

Summary: Yang et al. have developed a new method for low-temperature deposition of the absorber material in bifacial Cu(In,Ga)Se-2 photovoltaics, which successfully suppresses the formation of a detrimental GaOx interlayer and reduces back interface recombination, leading to a significant improvement in efficiency.

Summary: A monolithic perovskite/CIGS tandem solar cell with a certified power conversion efficiency (PCE) of 24.2% is demonstrated. The optimal device stack is determined using optical simulations, and the energy yield is evaluated. The results show the high potential of perovskite/CIGS tandem solar cells in significantly enhancing energy output.

Summary: This study explores the potential of producing high-efficiency solar cells at low temperatures (<=450 degrees C) by alloying CIGS with Ag to form ACIGS solar cells, which achieved an efficiency of 20.1%. Minimal efficiency degradation was observed for ACIGS absorbers deposited at lower temperatures, in contrast to more significant degradation in CIGS devices. Advanced characterization techniques revealed that the improved morphology, reduced tail states, and higher doping density in ACIGS absorbers were the key factors contributing to the higher efficiency of ACIGS devices compared to CIGS devices.